1 | /* $Id: dndmanager.cpp 69496 2017-10-28 14:55:58Z vboxsync $ */
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2 | /** @file
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3 | * Drag and Drop manager: Handling of DnD messages on the host side.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2011-2017 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | */
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17 |
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18 |
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19 | /*********************************************************************************************************************************
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20 | * Header Files *
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21 | *********************************************************************************************************************************/
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22 |
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23 | #ifdef LOG_GROUP
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24 | #undef LOG_GROUP
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25 | #endif
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26 | #define LOG_GROUP LOG_GROUP_GUEST_DND
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27 |
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28 | #include "dndmanager.h"
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29 |
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30 | #include <VBox/log.h>
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31 | #include <iprt/file.h>
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32 | #include <iprt/dir.h>
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33 | #include <iprt/path.h>
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34 | #include <iprt/uri.h>
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35 |
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36 |
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37 | /*********************************************************************************************************************************
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38 | * DnDManager *
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39 | *********************************************************************************************************************************/
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40 |
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41 | int DnDManager::addMessage(uint32_t uMsg, uint32_t cParms, VBOXHGCMSVCPARM paParms[], bool fAppend /* = true */)
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42 | {
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43 | int rc;
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44 |
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45 | try
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46 | {
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47 | LogFlowFunc(("uMsg=%RU32, cParms=%RU32, fAppend=%RTbool\n", uMsg, cParms, fAppend));
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48 |
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49 | DnDMessage *pMessage = new DnDGenericMessage(uMsg, cParms, paParms);
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50 | if (fAppend)
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51 | m_dndMessageQueue.append(pMessage);
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52 | else
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53 | m_dndMessageQueue.prepend(pMessage);
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54 |
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55 | rc = VINF_SUCCESS;
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56 | }
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57 | catch(std::bad_alloc &)
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58 | {
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59 | rc = VERR_NO_MEMORY;
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60 | }
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61 |
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62 | LogFlowFuncLeaveRC(rc);
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63 | return rc;
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64 | }
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65 |
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66 | HGCM::Message* DnDManager::nextHGCMMessage(void)
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67 | {
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68 | if (m_pCurMsg)
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69 | return m_pCurMsg->nextHGCMMessage();
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70 |
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71 | if (m_dndMessageQueue.isEmpty())
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72 | return NULL;
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73 |
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74 | return m_dndMessageQueue.first()->nextHGCMMessage();
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75 | }
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76 |
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77 | int DnDManager::nextMessageInfo(uint32_t *puMsg, uint32_t *pcParms)
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78 | {
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79 | AssertPtrReturn(puMsg, VERR_INVALID_POINTER);
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80 | AssertPtrReturn(pcParms, VERR_INVALID_POINTER);
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81 |
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82 | int rc;
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83 | if (m_pCurMsg)
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84 | rc = m_pCurMsg->currentMessageInfo(puMsg, pcParms);
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85 | else
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86 | {
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87 | if (m_dndMessageQueue.isEmpty())
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88 | rc = VERR_NO_DATA;
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89 | else
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90 | rc = m_dndMessageQueue.first()->currentMessageInfo(puMsg, pcParms);
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91 | }
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92 |
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93 | LogFlowFunc(("Returning puMsg=%RU32, pcParms=%RU32, rc=%Rrc\n", *puMsg, *pcParms, rc));
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94 | return rc;
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95 | }
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96 |
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97 | int DnDManager::nextMessage(uint32_t uMsg, uint32_t cParms, VBOXHGCMSVCPARM paParms[])
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98 | {
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99 | LogFlowFunc(("uMsg=%RU32, cParms=%RU32\n", uMsg, cParms));
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100 |
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101 | if (!m_pCurMsg)
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102 | {
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103 | /* Check for pending messages in our queue. */
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104 | if (m_dndMessageQueue.isEmpty())
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105 | return VERR_NO_DATA;
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106 |
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107 | m_pCurMsg = m_dndMessageQueue.first();
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108 | AssertPtr(m_pCurMsg);
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109 | m_dndMessageQueue.removeFirst();
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110 | }
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111 |
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112 | /* Fetch the current message info */
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113 | int rc = m_pCurMsg->currentMessage(uMsg, cParms, paParms);
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114 | /* If this message doesn't provide any additional sub messages, clear it. */
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115 | if (!m_pCurMsg->isMessageWaiting())
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116 | {
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117 | delete m_pCurMsg;
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118 | m_pCurMsg = NULL;
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119 | }
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120 |
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121 | /*
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122 | * If there was an error handling the current message or the user has canceled
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123 | * the operation, we need to cleanup all pending events and inform the progress
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124 | * callback about our exit.
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125 | */
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126 | if (RT_FAILURE(rc))
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127 | {
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128 | /* Clear any pending messages. */
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129 | clear();
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130 |
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131 | /* Create a new cancel message to inform the guest + call
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132 | * the host whether the current transfer was canceled or aborted
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133 | * due to an error. */
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134 | try
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135 | {
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136 | if (rc == VERR_CANCELLED)
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137 | LogFlowFunc(("Operation was cancelled\n"));
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138 |
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139 | Assert(!m_pCurMsg);
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140 | m_pCurMsg = new DnDHGCancelMessage();
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141 |
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142 | if (m_pfnProgressCallback)
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143 | {
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144 | LogFlowFunc(("Notifying host about aborting operation (%Rrc) ...\n", rc));
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145 | m_pfnProgressCallback( rc == VERR_CANCELLED
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146 | ? DragAndDropSvc::DND_PROGRESS_CANCELLED
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147 | : DragAndDropSvc::DND_PROGRESS_ERROR,
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148 | 100 /* Percent */, rc,
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149 | m_pvProgressUser);
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150 | }
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151 | }
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152 | catch(std::bad_alloc &)
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153 | {
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154 | rc = VERR_NO_MEMORY;
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155 | }
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156 | }
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157 |
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158 | LogFlowFunc(("Message processed with rc=%Rrc\n", rc));
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159 | return rc;
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160 | }
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161 |
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162 | void DnDManager::clear(void)
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163 | {
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164 | LogFlowFuncEnter();
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165 |
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166 | if (m_pCurMsg)
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167 | {
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168 | delete m_pCurMsg;
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169 | m_pCurMsg = NULL;
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170 | }
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171 |
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172 | while (!m_dndMessageQueue.isEmpty())
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173 | {
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174 | delete m_dndMessageQueue.last();
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175 | m_dndMessageQueue.removeLast();
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176 | }
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177 | }
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178 |
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179 | /**
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180 | * Triggers a rescheduling of the manager's message queue by setting the first
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181 | * message available in the queue as the current one to process.
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182 | *
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183 | * @return IPRT status code. VERR_NO_DATA if not message to process is available at
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184 | * the time of calling.
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185 | */
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186 | int DnDManager::doReschedule(void)
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187 | {
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188 | LogFlowFunc(("Rescheduling ...\n"));
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189 |
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190 | if (!m_dndMessageQueue.isEmpty())
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191 | {
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192 | m_pCurMsg = m_dndMessageQueue.first();
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193 | m_dndMessageQueue.removeFirst();
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194 |
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195 | return VINF_SUCCESS;
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196 | }
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197 |
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198 | return VERR_NO_DATA;
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199 | }
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200 |
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